212105116123 has 2 divisors, whose sum is σ = 212105116124. Its totient is φ = 212105116122.

The previous prime is 212105116099. The next prime is 212105116187. The reversal of 212105116123 is 321611501212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 212105116123 - 2⁹ = 212105115611 is a prime.

It is a super-2 number, since 2×212105116123² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (212105116193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106052558061 + 106052558062.

It is an arithmetic number, because the mean of its divisors is an integer number (106052558062).

Almost surely, 2^212105116123 is an apocalyptic number.

212105116123 is a deficient number, since it is larger than the sum of its proper divisors (1).

212105116123 is an equidigital number, since it uses as much as digits as its factorization.

212105116123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 25.

Adding to 212105116123 its reverse (321611501212), we get a palindrome (533716617335).

The spelling of 212105116123 in words is "two hundred twelve billion, one hundred five million, one hundred sixteen thousand, one hundred twenty-three".